Add rollup plugin that verifies and fixes the package.json (or other files)

[NullVoxPopuli]

¿porque?

A number of issues that are really hard to debug come from misconfigured package.jsons

• All ember-source modules missing from a build #1116
• potentially, Build Error (PackagerRunner) in node_modules\@glimmer\tracking\index.js #1132

This could be done via lints, which we can discuss, I suppose.
I was kinda thinking that since we have a rollup plugin that already alters the package.json, maybe we add another one that does stuff like:

• ensures data/structures exist:
  • type is unspecified
  • keywords has "ember-addon"
    • ember-addon has:
    • version: 2
    • type: addon
  • files has at least
    • output folder
  • if exports is specified,
    • all paths exist (imports, types, etc)
  • repository is correct (url, path, etc)

[ef4]

Yes, it would be good to implement this via eslint. Along with any v2-addon-specific rules, we probably want to add some of the standard eslint-plugin-ember rules to the blueprint too.

[ef4]

Superseded.